Metal-melting furnace.



O. J. WARMAN.

METAL MELTING FURNACE.

APPLICATION FILED MAR. 16. 1912.

1 1 58,875 Patented Nov. 2, 1915.

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ORA J'. WARMAN, OF CINCINNATI, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE BUCKEYE PRODUCTS COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

METAL-MELTING- FURNACE.

Specification of Letters Patent.

Patented Nov. 2, 1915.

Application filed March 16, 1912. Serial No. 684,126.

To all whom it may concern:

Be it known that I, ORA J. VARMAN, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Metal-Melting Furnaces, of which the following isa specification.

It is the object of my invention to provide a metal melting furnace of novel construction and so arranged as to receive a crucible in which the metal is arranged to be melted, the furnace being so constructed and arranged as to be fed by a fluid-fuel and preferably capable of having a pressure above atmospheric pressure maintained therein, and the invention will be readily understood. from the following description and claim, and from the drawing, in which latter:

Figure 1 is a side elevation of my 1mproved device. Fig. 2 is a plan View of the same. Fig. 3 is a vertical central section of the same taken on the line 3-3 of Fig. 2. Fig. 4 is a cross-section of the same, taken on the irregular line 14: of Fig. 3; and, Fig. 5 is an edge elevation of the lifting hinge for the cover of the furnace.

11 represents the body of the furnace which comprises a curved side-wall 12, shown as an annular wall. A pedestal 18 is surrounded by the wall, being preferably spaced from the side-wall by a channel 14:, the pedestal being shown extending upwardly from the bottom 15 of the furnace body. The side-wall 12, pedestal 1 3 and bottom 15 are preferably of fire-resisting material, such as fire-clay or fire-brick. The side-wall may be reinforced by an outer metal shell 16 provided with a metal bottom 17.

21 is a oover'for the furnace, preferably made of fire-resisting material, such as fireclay or fire-brick. It has an opening 22 located above the pedestal, a depending flange 23 surrounding said opening.

24 is a crucible which finds support on the pedestal and the upper end of which forms a mouth 25, preferably wider than the flange 28 and preferably on substantially a level with said flange, when the cover is closed.

The pedestal is provided with a nose 28 which has lateral receding walls 29 which merge into the curved side of the pedestal.

The furnace is provided with a fuel-inlet -31, shown as a cavity formed in the fireresisting side-wall of the furnace and sloping downwardly and inwardly so as to pr0- ject the fluid-fuel emitted therefrom toward the nose 28 and the bottom of the channel 14. This fuel-inlet is fed from a suitable source, shown as a pipe 32 for the fluid, such as gas or oil, preferably gas, provided with a regulating valve 33, and as a pipe 34; for air, preferably under pressure, a regulating valve 35 being provided in said pipe. The fluid passing through the pipe 32 is also preferably under pressure, and the fluid and air are arranged to be mixed in the mixing chamber 36, the mixed fuel being projected through the opening 37 of the jacket of the furnace into the fuel-inlet 31.

The fluid-fuel is projected under pressure through the fuel-inlet toward the nose 28 and the bottom of the channel 14, whereby the fuel is preferably divided, one branch finding a course about the pedestal in one direction, and the other branch finding a course about said pedestal in the opposite direction, the tendency being for these branches to continue their courses and to mingle with one another, so that the fuel, flame, heat and products of combustion are swirled about the pedestal and the crucible, the form of the pedestal, the inner face of the side-wall of the furnace, and the form of the crucible, the wall of which is preferably annular, aiding in these directions of movement of the fuel and heat, the flame, heat and products of combustion rising until theystrike the cover of the furnace, which is normally in closed relation, and impinge the annular flange surrounding the opening in the cover, whereby the flame and heat are projected downwardly into the interior of the crucible and across the metal therein before the substantially expended products of combustion find their way out of the opening in the cover above the crucible.

The construction is such that a pressure above atmospheric pressure is maintained inside the furnace. The construction is such further, that the fuel is superheated in the fuel-inlet 31 and at the bottom of the channel surrounding the pedestal adjacent to the nose thereof. The point of ignition of the fuel depends somewhat on the force with which it is projected into the furnace. The channel surrounding the pedestal therefore up of three sections 41, each of which is PlO'.

vided with ears42 at the ends thereof. At the forward portion of the cover the adja cent ends of the hoop-sections are connected by tie-bolts 43 having nuts 44 thereon. The

' adjacent ears at the rear of the hoop-sections are similarly connected. A bracket 46 is secured to the furnacecasing, the upper end of which is in the form of a shelf 47 48 is a cam-lever, the cam 49 whereof cooperates with the shelf. and is thereon.

pivotally movable 50, 50 are tension-rods, the upper ends. of which are pivoted about abolt 51 on the cam-lever, and the lower ends of which are articulated at 52 to the forward tie-bolts 43.

53 is a tension-rod articulated to the rear tie-bolt 43, as by means of a bearing-piece 54, the upper end of the tension-rod 53 being pivotedat 55 to the bolt 51, the cam 49 being preferably bifurcated for receiving the tension-rod 53 in the space 56 of said bifurcation. The tension-rod 53 is jonrnaled in abearing 57 of the shelf 47 and in a bearing .58 on the bracket 46.

When the cam-lever 48 is swung for- 'wardly in the direction of the arrow at, the

cam 49 acting on the shelf 47 will raise the cover 21.0f the furnace, while preferably the same is maintained parallel with the top of thefurnace, sufliciently for permitting the depending flange 23 to clear the top edge of i the side-wall of the furnace when the cover is swung laterally, the cover being permitted to move laterally in either direction, by swinging upon the tension-rod 53 which is,

V as stated, journaled in the bearings 57, 58.

The manner in which the fluid-fuel is projected slantingly downward and is received against the nose of the pedestal and in the channel at the bottom thereof, results 1n great saving of fuel and in obtaining an eX- ceedingly great number of heat-units out of the fuel, and further results in economical distribution of the fuel for obtalnlng complete combustion thereof.

Having thus fully described my invention, what lclaimias new and desire to secure by Letters Patent, is: I V

A metal melting furnace comprising an annular continuous fire-resistingslde wall rovided withfa sin 'le downwardl slantin l fuel-inlet, a fire-resisting pedestal having a per phery which 1s annular and contlnuous and concentric with said side wall except at that portion opposite said mouth of said fuel-inlet Where said pedestal is formed with a pointed deflecting nose located outside the circle ofsald periphery, said nose forming:

an angle opposite said mouth of said fuelinlet the sides whereof are tangentto said circle and merged into said annular periph ery, said periphery of said pedestal spaced from said side wall forming a channel sur- 7 i rounding'said pedestal between said pedestal and side wall, provided with a bottom at the lower ends of said pedestal and said wall, said mouth of said fuel-inlet opening slantingly downward into said channel below the top of said pedestal and spaced upwardly from said bottom, the longitudinal aXis'of said downwardly slanting fuel-inlet intersecting said angle adjacent to said bottom whereby the flame emitted from the mouth of said downwardly slanting fuel-inlet is projected slantingly downward against the bottoms of both sides of said angle at an angle to the bottom of said channel toward said bottom for rebounding from said bottom and thereby swirling about and above said pedestal. V

In testimony whereof, I have. hereunto signed my name in the presence of twosubscribingwitnesses. V g V ORA J. WARMAN.

WVitnesses: l I C. TATGENHORST, Jri,

THERESA SILBEIL.

Gopies of this patent may be obtained for five cents each, by addressing the Gommissioneroffatents,

' WashingtomD. C, p 

